FM / linux

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux

Name	Size	Mode	Actions
amba/	-	0755	rm
avf/	-	0755	rm
bcma/	-	0755	rm
byteorder/	-	0755	rm
can/	-	0755	rm
ceph/	-	0755	rm
clk/	-	0755	rm
crush/	-	0755	rm
decompress/	-	0755	rm
dma/	-	0755	rm
dsa/	-	0755	rm
extcon/	-	0755	rm
firmware/	-	0755	rm
fpga/	-	0755	rm
fsl/	-	0755	rm
gpio/	-	0755	rm
hsi/	-	0755	rm
iio/	-	0755	rm
input/	-	0755	rm
irqchip/	-	0755	rm
isdn/	-	0755	rm
lockd/	-	0755	rm
mailbox/	-	0755	rm
mfd/	-	0755	rm
mlx4/	-	0755	rm
mlx5/	-	0755	rm
mmc/	-	0755	rm
mtd/	-	0755	rm
mux/	-	0755	rm
net/	-	0755	rm
netfilter/	-	0755	rm
netfilter_arp/	-	0755	rm
netfilter_bridge/	-	0755	rm
netfilter_ipv4/	-	0755	rm
netfilter_ipv6/	-	0755	rm
pcs/	-	0755	rm
perf/	-	0755	rm
phy/	-	0755	rm
pinctrl/	-	0755	rm
platform_data/	-	0755	rm
power/	-	0755	rm
qed/	-	0755	rm
raid/	-	0755	rm
regulator/	-	0755	rm
remoteproc/	-	0755	rm
reset/	-	0755	rm
rpmsg/	-	0755	rm
rtc/	-	0755	rm
sched/	-	0755	rm
soc/	-	0755	rm
soundwire/	-	0755	rm
spi/	-	0755	rm
ssb/	-	0755	rm
sunrpc/	-	0755	rm
ulpi/	-	0755	rm
unaligned/	-	0755	rm
usb/	-	0755	rm
uwb/	-	0755	rm
wimax/	-	0755	rm
8250_pci.h	1038	0644	edit dl rm
a.out.h	354	0644	edit dl rm
acct.h	2551	0644	edit dl rm
acpi.h	43130	0644	edit dl rm
acpi_apmt.h	367	0644	edit dl rm
acpi_dma.h	3300	0644	edit dl rm
acpi_iort.h	3235	0644	edit dl rm
acpi_pmtmr.h	674	0644	edit dl rm
adb.h	1832	0644	edit dl rm
adfs_fs.h	574	0644	edit dl rm
adxl.h	310	0644	edit dl rm
aer.h	1822	0644	edit dl rm
agpgart.h	3908	0644	edit dl rm
agp_backend.h	3534	0644	edit dl rm
ahci-remap.h	607	0644	edit dl rm
ahci_platform.h	1772	0644	edit dl rm
aio.h	651	0644	edit dl rm
alarmtimer.h	1875	0644	edit dl rm
altera_jtaguart.h	379	0644	edit dl rm
altera_uart.h	397	0644	edit dl rm
amd-iommu.h	6931	0644	edit dl rm
amd-pstate.h	3356	0644	edit dl rm
anon_inodes.h	494	0644	edit dl rm
aperture.h	1619	0644	edit dl rm
apm-emulation.h	1575	0644	edit dl rm
apm_bios.h	2746	0644	edit dl rm
apple-gmux.h	1459	0644	edit dl rm
apple_bl.h	498	0644	edit dl rm
arch_topology.h	1983	0644	edit dl rm
arm-cci.h	2058	0644	edit dl rm
arm-smccc.h	16066	0644	edit dl rm
arm_sdei.h	2641	0644	edit dl rm
array_size.h	332	0644	edit dl rm
ascii85.h	532	0644	edit dl rm
asn1.h	2039	0644	edit dl rm
asn1_ber_bytecode.h	2783	0644	edit dl rm
asn1_decoder.h	675	0644	edit dl rm
assoc_array.h	3156	0644	edit dl rm
assoc_array_priv.h	5630	0644	edit dl rm
async.h	4591	0644	edit dl rm
async_tx.h	7487	0644	edit dl rm
ata.h	33980	0644	edit dl rm
atalk.h	4550	0644	edit dl rm
ata_platform.h	729	0644	edit dl rm
ath9k_platform.h	1477	0644	edit dl rm
atm.h	287	0644	edit dl rm
atmdev.h	10457	0644	edit dl rm
atmel-mci.h	1429	0644	edit dl rm
atmel-ssc.h	9971	0644	edit dl rm
atmel_pdc.h	1502	0644	edit dl rm
atmel_tc.h	11600	0644	edit dl rm
atm_suni.h	253	0644	edit dl rm
atm_tcp.h	511	0644	edit dl rm
atomic.h	37546	0644	edit dl rm
attribute_container.h	2799	0644	edit dl rm
audit.h	20332	0644	edit dl rm
audit_arch.h	559	0644	edit dl rm
auto_dev-ioctl.h	454	0644	edit dl rm
auto_fs.h	436	0644	edit dl rm
auxiliary_bus.h	2787	0644	edit dl rm
auxvec.h	304	0644	edit dl rm
average.h	2481	0644	edit dl rm
b1pcmcia.h	666	0644	edit dl rm
backing-dev-defs.h	10327	0644	edit dl rm
backing-dev.h	12260	0644	edit dl rm
backlight.h	13447	0644	edit dl rm
badblocks.h	2188	0644	edit dl rm
balloon_compaction.h	6745	0644	edit dl rm
bcd.h	559	0644	edit dl rm
bch.h	2660	0644	edit dl rm
bcm47xx_nvram.h	1247	0644	edit dl rm
bcm47xx_sprom.h	600	0644	edit dl rm
bcm47xx_wdt.h	555	0644	edit dl rm
bcm963xx_nvram.h	3036	0644	edit dl rm
bcm963xx_tag.h	3685	0644	edit dl rm
binfmts.h	5443	0644	edit dl rm
bio.h	20690	0644	edit dl rm
bitfield.h	5899	0644	edit dl rm
bitmap.h	21496	0644	edit dl rm
bitops.h	8870	0644	edit dl rm
bitrev.h	2541	0644	edit dl rm
bits.h	1512	0644	edit dl rm
bit_spinlock.h	2360	0644	edit dl rm
blk-cgroup.h	22728	0644	edit dl rm
blk-mq-pci.h	269	0644	edit dl rm
blk-mq-rdma.h	234	0644	edit dl rm
blk-mq-virtio.h	293	0644	edit dl rm
blk-mq.h	16074	0644	edit dl rm
blk-pm.h	717	0644	edit dl rm
blkdev.h	58898	0644	edit dl rm
blkpg.h	436	0644	edit dl rm
blktrace_api.h	3777	0644	edit dl rm
blk_types.h	15342	0644	edit dl rm
blockgroup_lock.h	810	0644	edit dl rm
bma150.h	1938	0644	edit dl rm
bottom_half.h	803	0644	edit dl rm
bpf-cgroup.h	19818	0644	edit dl rm
bpf-netns.h	1559	0644	edit dl rm
bpf.h	73387	0644	edit dl rm
bpfilter.h	791	0644	edit dl rm
bpfptr.h	1733	0644	edit dl rm
bpf_lirc.h	698	0644	edit dl rm
bpf_local_storage.h	5349	0644	edit dl rm
bpf_lsm.h	1431	0644	edit dl rm
bpf_trace.h	166	0644	edit dl rm
bpf_types.h	5395	0644	edit dl rm
bpf_verifier.h	18791	0644	edit dl rm
brcmphy.h	14023	0644	edit dl rm
bsearch.h	275	0644	edit dl rm
bsg-lib.h	2455	0644	edit dl rm
bsg.h	1094	0644	edit dl rm
btf.h	7363	0644	edit dl rm
btf_ids.h	5174	0644	edit dl rm
btree-128.h	2737	0644	edit dl rm
btree-type.h	3991	0644	edit dl rm
btree.h	6999	0644	edit dl rm
btrfs.h	145	0644	edit dl rm
buffer_head.h	14379	0644	edit dl rm
bug.h	1967	0644	edit dl rm
buildid.h	248	0644	edit dl rm
build_bug.h	3066	0644	edit dl rm
bvec.h	4119	0644	edit dl rm
c2port.h	1529	0644	edit dl rm
cache.h	2182	0644	edit dl rm
cacheinfo.h	4796	0644	edit dl rm
capability.h	8179	0644	edit dl rm
cb710.h	5827	0644	edit dl rm
cciss_ioctl.h	1053	0644	edit dl rm
ccp.h	18697	0644	edit dl rm
cc_platform.h	3140	0644	edit dl rm
cdev.h	845	0644	edit dl rm
cdrom.h	9193	0644	edit dl rm
cfag12864b.h	1499	0644	edit dl rm
cgroup-defs.h	27242	0644	edit dl rm
cgroup.h	28880	0644	edit dl rm
cgroup_rdma.h	1358	0644	edit dl rm
cgroup_subsys.h	1259	0644	edit dl rm
circ_buf.h	1120	0644	edit dl rm
cleancache.h	3982	0644	edit dl rm
cleanup.h	14215	0644	edit dl rm
clk-provider.h	37542	0644	edit dl rm
clk.h	25157	0644	edit dl rm
clkdev.h	1698	0644	edit dl rm
clockchips.h	7445	0644	edit dl rm
clocksource.h	9188	0644	edit dl rm
clock_cooling.h	2106	0644	edit dl rm
cm4000_cs.h	199	0644	edit dl rm
cma.h	1212	0644	edit dl rm
cmdline-parser.h	1238	0644	edit dl rm
cnt32_to_63.h	3691	0644	edit dl rm
cn_proc.h	1890	0644	edit dl rm
coda.h	2244	0644	edit dl rm
coda_psdev.h	2692	0644	edit dl rm
compaction.h	7654	0644	edit dl rm
compat.h	35739	0644	edit dl rm
compat_time.h	499	0644	edit dl rm
compiler-clang.h	2446	0644	edit dl rm
compiler-gcc.h	5756	0644	edit dl rm
compiler-intel.h	949	0644	edit dl rm
compiler.h	15718	0644	edit dl rm
compiler_attributes.h	10600	0644	edit dl rm
compiler_types.h	6931	0644	edit dl rm
completion.h	4201	0644	edit dl rm
component.h	4459	0644	edit dl rm
concap.h	3778	0644	edit dl rm
configfs.h	9441	0644	edit dl rm
connector.h	2490	0644	edit dl rm
console.h	7504	0644	edit dl rm
consolemap.h	1068	0644	edit dl rm
console_struct.h	6966	0644	edit dl rm
const.h	421	0644	edit dl rm
container.h	668	0644	edit dl rm
container_of.h	1278	0644	edit dl rm
context_tracking.h	5168	0644	edit dl rm
context_tracking_state.h	1529	0644	edit dl rm
cookie.h	1254	0644	edit dl rm
cordic.h	1794	0644	edit dl rm
coredump.h	797	0644	edit dl rm
coresight-pmu.h	989	0644	edit dl rm
coresight-stm.h	152	0644	edit dl rm
coresight.h	9676	0644	edit dl rm
counter.h	15497	0644	edit dl rm
counter_enum.h	1463	0644	edit dl rm
count_zeros.h	1660	0644	edit dl rm
cper.h	16826	0644	edit dl rm
cpu.h	7959	0644	edit dl rm
cpufeature.h	1882	0644	edit dl rm
cpufreq.h	34248	0644	edit dl rm
cpuhotplug.h	14269	0644	edit dl rm
cpuidle.h	13061	0644	edit dl rm
cpuidle_haltpoll.h	312	0644	edit dl rm
cpumask.h	29721	0644	edit dl rm
cpuset.h	8297	0644	edit dl rm
cpu_cooling.h	2389	0644	edit dl rm
cpu_pm.h	2850	0644	edit dl rm
cpu_rmap.h	1902	0644	edit dl rm
crash_core.h	3292	0644	edit dl rm
crash_dump.h	5193	0644	edit dl rm
crc-ccitt.h	609	0644	edit dl rm
crc-itu-t.h	613	0644	edit dl rm
crc-t10dif.h	453	0644	edit dl rm
crc4.h	192	0644	edit dl rm
crc7.h	316	0644	edit dl rm
crc8.h	3747	0644	edit dl rm
crc16.h	622	0644	edit dl rm
crc32.h	2894	0644	edit dl rm
crc32c.h	331	0644	edit dl rm
crc32poly.h	610	0644	edit dl rm
cred.h	12749	0644	edit dl rm
crypto.h	59393	0644	edit dl rm
cryptohash.h	546	0644	edit dl rm
cs5535.h	6426	0644	edit dl rm
ctype.h	1791	0644	edit dl rm
cuda.h	501	0644	edit dl rm
cxl_err.h	468	0644	edit dl rm
cyclades.h	10607	0644	edit dl rm
damon.h	19616	0644	edit dl rm
davinci_emac.h	1150	0644	edit dl rm
dax.h	7553	0644	edit dl rm
dca.h	2698	0644	edit dl rm
dcache.h	19621	0644	edit dl rm
dccp.h	10989	0644	edit dl rm
dcookies.h	1329	0644	edit dl rm
debugfs.h	11921	0644	edit dl rm
debugobjects.h	3988	0644	edit dl rm
debug_locks.h	1627	0644	edit dl rm
delay.h	2335	0644	edit dl rm
delayacct.h	6285	0644	edit dl rm
delayed_call.h	709	0644	edit dl rm
dell-led.h	128	0644	edit dl rm
devcoredump.h	2849	0644	edit dl rm
devfreq-event.h	5778	0644	edit dl rm
devfreq.h	12987	0644	edit dl rm
devfreq_cooling.h	3608	0644	edit dl rm
device-mapper.h	19529	0644	edit dl rm
device.h	67275	0644	edit dl rm
device_cgroup.h	1680	0644	edit dl rm
devm-helpers.h	2740	0644	edit dl rm
devpts_fs.h	1314	0644	edit dl rm
dev_printk.h	7731	0644	edit dl rm
digsig.h	1379	0644	edit dl rm
dim.h	8951	0644	edit dl rm
dio.h	11229	0644	edit dl rm
dirent.h	216	0644	edit dl rm
dlm.h	7240	0644	edit dl rm
dlm_plock.h	678	0644	edit dl rm
dm-bufio.h	4574	0644	edit dl rm
dm-dirty-log.h	4038	0644	edit dl rm
dm-io.h	1980	0644	edit dl rm
dm-kcopyd.h	3013	0644	edit dl rm
dm-region-hash.h	3182	0644	edit dl rm
dm9000.h	1136	0644	edit dl rm
dma-buf.h	21547	0644	edit dl rm
dma-contiguous.h	5070	0644	edit dl rm
dma-direct.h	3681	0644	edit dl rm
dma-direction.h	407	0644	edit dl rm
dma-fence-array.h	2983	0644	edit dl rm
dma-fence-chain.h	3576	0644	edit dl rm
dma-fence-unwrap.h	2298	0644	edit dl rm
dma-fence.h	21162	0644	edit dl rm
dma-iommu.h	3020	0644	edit dl rm
dma-map-ops.h	10863	0644	edit dl rm
dma-mapping.h	23170	0644	edit dl rm
dma-resv.h	17245	0644	edit dl rm
dmaengine.h	54891	0644	edit dl rm
dmapool.h	1832	0644	edit dl rm
dmar.h	8791	0644	edit dl rm
dmi.h	4375	0644	edit dl rm
dnotify.h	1047	0644	edit dl rm
dns_resolver.h	1339	0644	edit dl rm
dqblk_qtree.h	2238	0644	edit dl rm
dqblk_v1.h	327	0644	edit dl rm
dqblk_v2.h	406	0644	edit dl rm
drbd.h	10923	0644	edit dl rm
drbd_genl.h	22010	0644	edit dl rm
drbd_genl_api.h	1808	0644	edit dl rm
drbd_limits.h	8003	0644	edit dl rm
ds2782_battery.h	158	0644	edit dl rm
dtlk.h	3584	0644	edit dl rm
dw_apb_timer.h	1743	0644	edit dl rm
dynamic_debug.h	5831	0644	edit dl rm
dynamic_queue_limits.h	3812	0644	edit dl rm
earlycpio.h	359	0644	edit dl rm
ecryptfs.h	3915	0644	edit dl rm
edac.h	20718	0644	edit dl rm
edd.h	1469	0644	edit dl rm
edma.h	807	0644	edit dl rm
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eeprom_93xx46.h	776	0644	edit dl rm
efi-bgrt.h	644	0644	edit dl rm
efi.h	62813	0644	edit dl rm
efs_vh.h	1585	0644	edit dl rm
eisa.h	3031	0644	edit dl rm
elevator.h	6059	0644	edit dl rm
elf-fdpic.h	2237	0644	edit dl rm
elf-randomize.h	583	0644	edit dl rm
elf.h	1565	0644	edit dl rm
elfcore-compat.h	1267	0644	edit dl rm
elfcore.h	2160	0644	edit dl rm
elfnote.h	3625	0644	edit dl rm
enclosure.h	4711	0644	edit dl rm
energy_model.h	5994	0644	edit dl rm
err.h	1583	0644	edit dl rm
errname.h	283	0644	edit dl rm
errno.h	1424	0644	edit dl rm
error-injection.h	607	0644	edit dl rm
errqueue.h	524	0644	edit dl rm
errseq.h	382	0644	edit dl rm
etherdevice.h	16917	0644	edit dl rm
ethtool.h	35580	0644	edit dl rm
ethtool_netlink.h	1920	0644	edit dl rm
eventfd.h	2167	0644	edit dl rm
eventpoll.h	2457	0644	edit dl rm
evm.h	2985	0644	edit dl rm
export.h	3697	0644	edit dl rm
exportfs.h	7692	0644	edit dl rm
ext2_fs.h	967	0644	edit dl rm
extable.h	1309	0644	edit dl rm
extcon-provider.h	4431	0644	edit dl rm
extcon.h	10270	0644	edit dl rm
f2fs_fs.h	18526	0644	edit dl rm
f75375s.h	541	0644	edit dl rm
falloc.h	1719	0644	edit dl rm
fanotify.h	2336	0644	edit dl rm
fault-inject.h	1975	0644	edit dl rm
fb.h	28712	0644	edit dl rm
fbcon.h	2136	0644	edit dl rm
fcdevice.h	988	0644	edit dl rm
fcntl.h	1808	0644	edit dl rm
fd.h	490	0644	edit dl rm
fddidevice.h	1044	0644	edit dl rm
fdtable.h	3616	0644	edit dl rm
fec.h	609	0644	edit dl rm
file.h	3147	0644	edit dl rm
filter.h	42781	0644	edit dl rm
fips.h	167	0644	edit dl rm
firewire.h	13868	0644	edit dl rm
firmware-map.h	1351	0644	edit dl rm
firmware.h	5874	0644	edit dl rm
fixp-arith.h	4516	0644	edit dl rm
flat.h	1653	0644	edit dl rm
flex_array.h	4412	0644	edit dl rm
flex_proportions.h	2881	0644	edit dl rm
fmc-sdb.h	1319	0644	edit dl rm
fmc.h	9877	0644	edit dl rm
font.h	1598	0644	edit dl rm
fortify-string.h	16550	0644	edit dl rm
freezer.h	9257	0644	edit dl rm
frontswap.h	3121	0644	edit dl rm
fs.h	118914	0644	edit dl rm
fscache-cache.h	19254	0644	edit dl rm
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fsi.h	2424	0644	edit dl rm
fsl-diu-fb.h	4179	0644	edit dl rm
fsldma.h	398	0644	edit dl rm
fsl_devices.h	4430	0644	edit dl rm
fsl_hypervisor.h	2824	0644	edit dl rm
fsl_ifc.h	25658	0644	edit dl rm
fsnotify.h	7796	0644	edit dl rm
fsnotify_backend.h	20665	0644	edit dl rm
fs_context.h	9097	0644	edit dl rm
fs_enet_pd.h	3457	0644	edit dl rm
fs_parser.h	4750	0644	edit dl rm
fs_pin.h	619	0644	edit dl rm
fs_stack.h	811	0644	edit dl rm
fs_struct.h	1751	0644	edit dl rm
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gcd.h	193	0644	edit dl rm
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genetlink.h	1379	0644	edit dl rm
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getcpu.h	641	0644	edit dl rm
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goldfish.h	605	0644	edit dl rm
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gpio.h	5478	0644	edit dl rm
gpio_keys.h	1782	0644	edit dl rm
hardirq.h	3264	0644	edit dl rm
hash.h	2998	0644	edit dl rm
hashtable.h	6805	0644	edit dl rm
hdlc.h	3413	0644	edit dl rm
hdlcdrv.h	6470	0644	edit dl rm
hdmi.h	12851	0644	edit dl rm
hid-debug.h	1458	0644	edit dl rm
hid-roccat.h	484	0644	edit dl rm
hid-sensor-hub.h	9190	0644	edit dl rm
hid-sensor-ids.h	7617	0644	edit dl rm
hid.h	38339	0644	edit dl rm
hidden.h	966	0644	edit dl rm
hiddev.h	1458	0644	edit dl rm
hidraw.h	1146	0644	edit dl rm
highmem-internal.h	4952	0644	edit dl rm
highmem.h	8235	0644	edit dl rm
highuid.h	3194	0644	edit dl rm
hil.h	18857	0644	edit dl rm
hil_mlc.h	5249	0644	edit dl rm
hippidevice.h	1263	0644	edit dl rm
hmm.h	4656	0644	edit dl rm
host1x.h	8618	0644	edit dl rm
hpet.h	2615	0644	edit dl rm
hp_sdc.h	14352	0644	edit dl rm
hrtimer.h	16651	0644	edit dl rm
hrtimer_defs.h	660	0644	edit dl rm
htcpld.h	617	0644	edit dl rm
hugetlb.h	27496	0644	edit dl rm
hugetlb_cgroup.h	7056	0644	edit dl rm
hugetlb_inline.h	374	0644	edit dl rm
huge_mm.h	15743	0644	edit dl rm
hwmon-sysfs.h	2024	0644	edit dl rm
hwmon-vid.h	1518	0644	edit dl rm
hwmon.h	14084	0644	edit dl rm
hwspinlock.h	13044	0644	edit dl rm
hw_breakpoint.h	4405	0644	edit dl rm
hw_random.h	2377	0644	edit dl rm
hyperv.h	50010	0644	edit dl rm
hypervisor.h	748	0644	edit dl rm
i2c-algo-bit.h	2322	0644	edit dl rm
i2c-algo-pca.h	2599	0644	edit dl rm
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Edit: /usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/rcupdate.h (38548B)

/*
 * Read-Copy Update mechanism for mutual exclusion
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can access it online at
 * http://www.gnu.org/licenses/gpl-2.0.html.
 *
 * Copyright IBM Corporation, 2001
 *
 * Author: Dipankar Sarma <dipankar@in.ibm.com>
 *
 * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
 * Papers:
 * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf
 * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001)
 *
 * For detailed explanation of Read-Copy Update mechanism see -
 *		http://lse.sourceforge.net/locking/rcupdate.html
 *
 */

#ifndef __LINUX_RCUPDATE_H
#define __LINUX_RCUPDATE_H

#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/atomic.h>
#include <linux/irqflags.h>
#include <linux/preempt.h>
#include <linux/bottom_half.h>
#include <linux/lockdep.h>
#include <linux/cleanup.h>
#include <asm/processor.h>
#include <linux/cpumask.h>

#define ULONG_CMP_GE(a, b)	(ULONG_MAX / 2 >= (a) - (b))
#define ULONG_CMP_LT(a, b)	(ULONG_MAX / 2 < (a) - (b))
#define ulong2long(a)		(*(long *)(&(a)))
#define USHORT_CMP_GE(a, b)	(USHRT_MAX / 2 >= (unsigned short)((a) - (b)))
#define USHORT_CMP_LT(a, b)	(USHRT_MAX / 2 < (unsigned short)((a) - (b)))

/* Exported common interfaces */
void call_rcu(struct rcu_head *head, rcu_callback_t func);
void rcu_barrier_tasks(void);
void rcu_barrier_tasks_rude(void);
void synchronize_rcu(void);

#ifdef CONFIG_PREEMPT_RCU

void __rcu_read_lock(void);
void __rcu_read_unlock(void);

/*
 * Defined as a macro as it is a very low level header included from
 * areas that don't even know about current.  This gives the rcu_read_lock()
 * nesting depth, but makes sense only if CONFIG_PREEMPT_RCU -- in other
 * types of kernel builds, the rcu_read_lock() nesting depth is unknowable.
 */
#define rcu_preempt_depth() (current->rcu_read_lock_nesting)

#else /* #ifdef CONFIG_PREEMPT_RCU */

#ifdef CONFIG_TINY_RCU
#define rcu_read_unlock_strict() do { } while (0)
#else
void rcu_read_unlock_strict(void);
#endif

static inline void __rcu_read_lock(void)
{
	preempt_disable();
}

static inline void __rcu_read_unlock(void)
{
	preempt_enable();
	if (IS_ENABLED(CONFIG_RCU_STRICT_GRACE_PERIOD))
		rcu_read_unlock_strict();
}

static inline int rcu_preempt_depth(void)
{
	return 0;
}

#endif /* #else #ifdef CONFIG_PREEMPT_RCU */

/* Internal to kernel */
void rcu_init(void);
extern int rcu_scheduler_active __read_mostly;
void rcu_sched_clock_irq(int user);
void rcu_report_dead(unsigned int cpu);
void rcutree_migrate_callbacks(int cpu);

#ifdef CONFIG_TASKS_RCU_GENERIC
void rcu_init_tasks_generic(void);
#else
static inline void rcu_init_tasks_generic(void) { }
#endif

#ifdef CONFIG_RCU_STALL_COMMON
void rcu_sysrq_start(void);
void rcu_sysrq_end(void);
#else /* #ifdef CONFIG_RCU_STALL_COMMON */
static inline void rcu_sysrq_start(void) { }
static inline void rcu_sysrq_end(void) { }
#endif /* #else #ifdef CONFIG_RCU_STALL_COMMON */

#ifdef CONFIG_NO_HZ_FULL
void rcu_user_enter(void);
void rcu_user_exit(void);
#else
static inline void rcu_user_enter(void) { }
static inline void rcu_user_exit(void) { }
#endif /* CONFIG_NO_HZ_FULL */

#ifdef CONFIG_RCU_NOCB_CPU
void rcu_init_nohz(void);
int rcu_nocb_cpu_offload(int cpu);
int rcu_nocb_cpu_deoffload(int cpu);
void rcu_nocb_flush_deferred_wakeup(void);
#else /* #ifdef CONFIG_RCU_NOCB_CPU */
static inline void rcu_init_nohz(void) { }
static inline int rcu_nocb_cpu_offload(int cpu) { return -EINVAL; }
static inline int rcu_nocb_cpu_deoffload(int cpu) { return 0; }
static inline void rcu_nocb_flush_deferred_wakeup(void) { }
#endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */

/**
 * RCU_NONIDLE - Indicate idle-loop code that needs RCU readers
 * @a: Code that RCU needs to pay attention to.
 *
 * RCU read-side critical sections are forbidden in the inner idle loop,
 * that is, between the rcu_idle_enter() and the rcu_idle_exit() -- RCU
 * will happily ignore any such read-side critical sections.  However,
 * things like powertop need tracepoints in the inner idle loop.
 *
 * This macro provides the way out:  RCU_NONIDLE(do_something_with_RCU())
 * will tell RCU that it needs to pay attention, invoke its argument
 * (in this example, calling the do_something_with_RCU() function),
 * and then tell RCU to go back to ignoring this CPU.  It is permissible
 * to nest RCU_NONIDLE() wrappers, but not indefinitely (but the limit is
 * on the order of a million or so, even on 32-bit systems).  It is
 * not legal to block within RCU_NONIDLE(), nor is it permissible to
 * transfer control either into or out of RCU_NONIDLE()'s statement.
 */
#define RCU_NONIDLE(a) \
	do { \
		rcu_irq_enter_irqson(); \
		do { a; } while (0); \
		rcu_irq_exit_irqson(); \
	} while (0)

/*
 * Note a quasi-voluntary context switch for RCU-tasks's benefit.
 * This is a macro rather than an inline function to avoid #include hell.
 */
#ifdef CONFIG_TASKS_RCU_GENERIC

# ifdef CONFIG_TASKS_RCU
# define rcu_tasks_classic_qs(t, preempt)				\
	do {								\
		if (!(preempt) && READ_ONCE((t)->rcu_tasks_holdout))	\
			WRITE_ONCE((t)->rcu_tasks_holdout, false);	\
	} while (0)
void call_rcu_tasks(struct rcu_head *head, rcu_callback_t func);
void synchronize_rcu_tasks(void);
# else
# define rcu_tasks_classic_qs(t, preempt) do { } while (0)
# define call_rcu_tasks call_rcu
# define synchronize_rcu_tasks synchronize_rcu
# endif

# ifdef CONFIG_TASKS_TRACE_RCU
# define rcu_tasks_trace_qs(t)					\
	do {								\
		struct task_struct_rh *t_rh = (t)->task_struct_rh;	\
		if (!likely(READ_ONCE(t_rh->trc_reader_checked)) &&	\
		    !unlikely(READ_ONCE(t_rh->trc_reader_nesting))) {	\
			smp_store_release(&t_rh->trc_reader_checked, true); \
			smp_mb(); /* Readers partitioned by store. */	\
		}							\
	} while (0)
# else
# define rcu_tasks_trace_qs(t) do { } while (0)
# endif

#define rcu_tasks_qs(t, preempt)					\
do {									\
	rcu_tasks_classic_qs((t), (preempt));				\
	rcu_tasks_trace_qs((t));					\
} while (0)

# ifdef CONFIG_TASKS_RUDE_RCU
void call_rcu_tasks_rude(struct rcu_head *head, rcu_callback_t func);
void synchronize_rcu_tasks_rude(void);
# endif

#define rcu_note_voluntary_context_switch(t) rcu_tasks_qs(t, false)
void exit_tasks_rcu_start(void);
void exit_tasks_rcu_finish(void);
#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
#define rcu_tasks_qs(t, preempt) do { } while (0)
#define rcu_note_voluntary_context_switch(t) do { } while (0)
#define call_rcu_tasks call_rcu
#define synchronize_rcu_tasks synchronize_rcu
static inline void exit_tasks_rcu_start(void) { }
static inline void exit_tasks_rcu_finish(void) { }
#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */

/**
 * cond_resched_tasks_rcu_qs - Report potential quiescent states to RCU
 *
 * This macro resembles cond_resched(), except that it is defined to
 * report potential quiescent states to RCU-tasks even if the cond_resched()
 * machinery were to be shut off, as some advocate for PREEMPTION kernels.
 */
#define cond_resched_tasks_rcu_qs() \
do { \
	rcu_tasks_qs(current, false); \
	cond_resched(); \
} while (0)

/*
 * Infrastructure to implement the synchronize_() primitives in
 * TREE_RCU and rcu_barrier_() primitives in TINY_RCU.
 */

#if defined(CONFIG_TREE_RCU)
#include <linux/rcutree.h>
#elif defined(CONFIG_TINY_RCU)
#include <linux/rcutiny.h>
#else
#error "Unknown RCU implementation specified to kernel configuration"
#endif

/*
 * The init_rcu_head_on_stack() and destroy_rcu_head_on_stack() calls
 * are needed for dynamic initialization and destruction of rcu_head
 * on the stack, and init_rcu_head()/destroy_rcu_head() are needed for
 * dynamic initialization and destruction of statically allocated rcu_head
 * structures.  However, rcu_head structures allocated dynamically in the
 * heap don't need any initialization.
 */
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
void init_rcu_head(struct rcu_head *head);
void destroy_rcu_head(struct rcu_head *head);
void init_rcu_head_on_stack(struct rcu_head *head);
void destroy_rcu_head_on_stack(struct rcu_head *head);
#else /* !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
static inline void init_rcu_head(struct rcu_head *head) { }
static inline void destroy_rcu_head(struct rcu_head *head) { }
static inline void init_rcu_head_on_stack(struct rcu_head *head) { }
static inline void destroy_rcu_head_on_stack(struct rcu_head *head) { }
#endif	/* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */

#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU)
bool rcu_lockdep_current_cpu_online(void);
#else /* #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU) */
static inline bool rcu_lockdep_current_cpu_online(void) { return true; }
#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PROVE_RCU) */

#ifdef CONFIG_DEBUG_LOCK_ALLOC

static inline void rcu_lock_acquire(struct lockdep_map *map)
{
	lock_acquire(map, 0, 0, 2, 0, NULL, _THIS_IP_);
}

static inline void rcu_lock_release(struct lockdep_map *map)
{
	lock_release(map, _THIS_IP_);
}

extern struct lockdep_map rcu_lock_map;
extern struct lockdep_map rcu_bh_lock_map;
extern struct lockdep_map rcu_sched_lock_map;
extern struct lockdep_map rcu_callback_map;
int debug_lockdep_rcu_enabled(void);
int rcu_read_lock_held(void);
int rcu_read_lock_bh_held(void);
int rcu_read_lock_sched_held(void);
int rcu_read_lock_any_held(void);

#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */

# define rcu_lock_acquire(a)		do { } while (0)
# define rcu_lock_release(a)		do { } while (0)

static inline int rcu_read_lock_held(void)
{
	return 1;
}

static inline int rcu_read_lock_bh_held(void)
{
	return 1;
}

static inline int rcu_read_lock_sched_held(void)
{
	return !preemptible();
}

static inline int rcu_read_lock_any_held(void)
{
	return !preemptible();
}

#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */

#ifdef CONFIG_PROVE_RCU

/**
 * RCU_LOCKDEP_WARN - emit lockdep splat if specified condition is met
 * @c: condition to check
 * @s: informative message
 */
#define RCU_LOCKDEP_WARN(c, s)						\
	do {								\
		static bool __section(.data.unlikely) __warned;		\
		if ((c) && debug_lockdep_rcu_enabled() && !__warned) {	\
			__warned = true;				\
			lockdep_rcu_suspicious(__FILE__, __LINE__, s);	\
		}							\
	} while (0)

#if defined(CONFIG_PROVE_RCU) && !defined(CONFIG_PREEMPT_RCU)
static inline void rcu_preempt_sleep_check(void)
{
	RCU_LOCKDEP_WARN(lock_is_held(&rcu_lock_map),
			 "Illegal context switch in RCU read-side critical section");
}
#else /* #ifdef CONFIG_PROVE_RCU */
static inline void rcu_preempt_sleep_check(void) { }
#endif /* #else #ifdef CONFIG_PROVE_RCU */

#define rcu_sleep_check()						\
	do {								\
		rcu_preempt_sleep_check();				\
		RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map),	\
				 "Illegal context switch in RCU-bh read-side critical section"); \
		RCU_LOCKDEP_WARN(lock_is_held(&rcu_sched_lock_map),	\
				 "Illegal context switch in RCU-sched read-side critical section"); \
	} while (0)

#else /* #ifdef CONFIG_PROVE_RCU */

#define RCU_LOCKDEP_WARN(c, s) do { } while (0)
#define rcu_sleep_check() do { } while (0)

#endif /* #else #ifdef CONFIG_PROVE_RCU */

/*
 * Helper functions for rcu_dereference_check(), rcu_dereference_protected()
 * and rcu_assign_pointer().  Some of these could be folded into their
 * callers, but they are left separate in order to ease introduction of
 * multiple pointers markings to match different RCU implementations
 * (e.g., __srcu), should this make sense in the future.
 */

#ifdef __CHECKER__
#define rcu_check_sparse(p, space) \
	((void)(((typeof(*p) space *)p) == p))
#else /* #ifdef __CHECKER__ */
#define rcu_check_sparse(p, space)
#endif /* #else #ifdef __CHECKER__ */

/**
 * unrcu_pointer - mark a pointer as not being RCU protected
 * @p: pointer needing to lose its __rcu property
 *
 * Converts @p from an __rcu pointer to a __kernel pointer.
 * This allows an __rcu pointer to be used with xchg() and friends.
 */
#define unrcu_pointer(p)						\
({									\
	typeof(*p) *_________p1 = (typeof(*p) *__force)(p);		\
	rcu_check_sparse(p, __rcu);					\
	((typeof(*p) __force __kernel *)(_________p1)); 		\
})

#define __rcu_access_pointer(p, space) \
({ \
	typeof(*p) *_________p1 = (typeof(*p) *__force)READ_ONCE(p); \
	rcu_check_sparse(p, space); \
	((typeof(*p) __force __kernel *)(_________p1)); \
})
#define __rcu_dereference_check(p, c, space) \
({ \
	/* Dependency order vs. p above. */ \
	typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \
	RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_check() usage"); \
	rcu_check_sparse(p, space); \
	((typeof(*p) __force __kernel *)(________p1)); \
})
#define __rcu_dereference_protected(p, c, space) \
({ \
	RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
	rcu_check_sparse(p, space); \
	((typeof(*p) __force __kernel *)(p)); \
})
#define rcu_dereference_raw(p) \
({ \
	/* Dependency order vs. p above. */ \
	typeof(p) ________p1 = READ_ONCE(p); \
	((typeof(*p) __force __kernel *)(________p1)); \
})

/**
 * RCU_INITIALIZER() - statically initialize an RCU-protected global variable
 * @v: The value to statically initialize with.
 */
#define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)

/**
 * rcu_assign_pointer() - assign to RCU-protected pointer
 * @p: pointer to assign to
 * @v: value to assign (publish)
 *
 * Assigns the specified value to the specified RCU-protected
 * pointer, ensuring that any concurrent RCU readers will see
 * any prior initialization.
 *
 * Inserts memory barriers on architectures that require them
 * (which is most of them), and also prevents the compiler from
 * reordering the code that initializes the structure after the pointer
 * assignment.  More importantly, this call documents which pointers
 * will be dereferenced by RCU read-side code.
 *
 * In some special cases, you may use RCU_INIT_POINTER() instead
 * of rcu_assign_pointer().  RCU_INIT_POINTER() is a bit faster due
 * to the fact that it does not constrain either the CPU or the compiler.
 * That said, using RCU_INIT_POINTER() when you should have used
 * rcu_assign_pointer() is a very bad thing that results in
 * impossible-to-diagnose memory corruption.  So please be careful.
 * See the RCU_INIT_POINTER() comment header for details.
 *
 * Note that rcu_assign_pointer() evaluates each of its arguments only
 * once, appearances notwithstanding.  One of the "extra" evaluations
 * is in typeof() and the other visible only to sparse (__CHECKER__),
 * neither of which actually execute the argument.  As with most cpp
 * macros, this execute-arguments-only-once property is important, so
 * please be careful when making changes to rcu_assign_pointer() and the
 * other macros that it invokes.
 */
#define rcu_assign_pointer(p, v)					      \
do {									      \
	uintptr_t _r_a_p__v = (uintptr_t)(v);				      \
	rcu_check_sparse(p, __rcu);					      \
									      \
	if (__builtin_constant_p(v) && (_r_a_p__v) == (uintptr_t)NULL)	      \
		WRITE_ONCE((p), (typeof(p))(_r_a_p__v));		      \
	else								      \
		smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
} while (0)

/**
 * rcu_replace_pointer() - replace an RCU pointer, returning its old value
 * @rcu_ptr: RCU pointer, whose old value is returned
 * @ptr: regular pointer
 * @c: the lockdep conditions under which the dereference will take place
 *
 * Perform a replacement, where @rcu_ptr is an RCU-annotated
 * pointer and @c is the lockdep argument that is passed to the
 * rcu_dereference_protected() call used to read that pointer.  The old
 * value of @rcu_ptr is returned, and @rcu_ptr is set to @ptr.
 */
#define rcu_replace_pointer(rcu_ptr, ptr, c)				\
({									\
	typeof(ptr) __tmp = rcu_dereference_protected((rcu_ptr), (c));	\
	rcu_assign_pointer((rcu_ptr), (ptr));				\
	__tmp;								\
})

/**
 * rcu_swap_protected() - swap an RCU and a regular pointer
 * @rcu_ptr: RCU pointer
 * @ptr: regular pointer
 * @c: the conditions under which the dereference will take place
 *
 * Perform swap(@rcu_ptr, @ptr) where @rcu_ptr is an RCU-annotated pointer and
 * @c is the argument that is passed to the rcu_dereference_protected() call
 * used to read that pointer.
 */
#define rcu_swap_protected(rcu_ptr, ptr, c) do {			\
	typeof(ptr) __tmp = rcu_dereference_protected((rcu_ptr), (c));	\
	rcu_assign_pointer((rcu_ptr), (ptr));				\
	(ptr) = __tmp;							\
} while (0)

/**
 * rcu_access_pointer() - fetch RCU pointer with no dereferencing
 * @p: The pointer to read
 *
 * Return the value of the specified RCU-protected pointer, but omit the
 * lockdep checks for being in an RCU read-side critical section.  This is
 * useful when the value of this pointer is accessed, but the pointer is
 * not dereferenced, for example, when testing an RCU-protected pointer
 * against NULL.  Although rcu_access_pointer() may also be used in cases
 * where update-side locks prevent the value of the pointer from changing,
 * you should instead use rcu_dereference_protected() for this use case.
 *
 * It is also permissible to use rcu_access_pointer() when read-side
 * access to the pointer was removed at least one grace period ago, as
 * is the case in the context of the RCU callback that is freeing up
 * the data, or after a synchronize_rcu() returns.  This can be useful
 * when tearing down multi-linked structures after a grace period
 * has elapsed.
 */
#define rcu_access_pointer(p) __rcu_access_pointer((p), __rcu)

/**
 * rcu_dereference_check() - rcu_dereference with debug checking
 * @p: The pointer to read, prior to dereferencing
 * @c: The conditions under which the dereference will take place
 *
 * Do an rcu_dereference(), but check that the conditions under which the
 * dereference will take place are correct.  Typically the conditions
 * indicate the various locking conditions that should be held at that
 * point.  The check should return true if the conditions are satisfied.
 * An implicit check for being in an RCU read-side critical section
 * (rcu_read_lock()) is included.
 *
 * For example:
 *
 *	bar = rcu_dereference_check(foo->bar, lockdep_is_held(&foo->lock));
 *
 * could be used to indicate to lockdep that foo->bar may only be dereferenced
 * if either rcu_read_lock() is held, or that the lock required to replace
 * the bar struct at foo->bar is held.
 *
 * Note that the list of conditions may also include indications of when a lock
 * need not be held, for example during initialisation or destruction of the
 * target struct:
 *
 *	bar = rcu_dereference_check(foo->bar, lockdep_is_held(&foo->lock) ||
 *					      atomic_read(&foo->usage) == 0);
 *
 * Inserts memory barriers on architectures that require them
 * (currently only the Alpha), prevents the compiler from refetching
 * (and from merging fetches), and, more importantly, documents exactly
 * which pointers are protected by RCU and checks that the pointer is
 * annotated as __rcu.
 */
#define rcu_dereference_check(p, c) \
	__rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu)

/**
 * rcu_dereference_bh_check() - rcu_dereference_bh with debug checking
 * @p: The pointer to read, prior to dereferencing
 * @c: The conditions under which the dereference will take place
 *
 * This is the RCU-bh counterpart to rcu_dereference_check().  However,
 * please note that starting in v5.0 kernels, vanilla RCU grace periods
 * wait for local_bh_disable() regions of code in addition to regions of
 * code demarked by rcu_read_lock() and rcu_read_unlock().  This means
 * that synchronize_rcu(), call_rcu, and friends all take not only
 * rcu_read_lock() but also rcu_read_lock_bh() into account.
 */
#define rcu_dereference_bh_check(p, c) \
	__rcu_dereference_check((p), (c) || rcu_read_lock_bh_held(), __rcu)

/**
 * rcu_dereference_sched_check() - rcu_dereference_sched with debug checking
 * @p: The pointer to read, prior to dereferencing
 * @c: The conditions under which the dereference will take place
 *
 * This is the RCU-sched counterpart to rcu_dereference_check().
 * However, please note that starting in v5.0 kernels, vanilla RCU grace
 * periods wait for preempt_disable() regions of code in addition to
 * regions of code demarked by rcu_read_lock() and rcu_read_unlock().
 * This means that synchronize_rcu(), call_rcu, and friends all take not
 * only rcu_read_lock() but also rcu_read_lock_sched() into account.
 */
#define rcu_dereference_sched_check(p, c) \
	__rcu_dereference_check((p), (c) || rcu_read_lock_sched_held(), \
				__rcu)

/*
 * The tracing infrastructure traces RCU (we want that), but unfortunately
 * some of the RCU checks causes tracing to lock up the system.
 *
 * The no-tracing version of rcu_dereference_raw() must not call
 * rcu_read_lock_held().
 */
#define rcu_dereference_raw_notrace(p) __rcu_dereference_check((p), 1, __rcu)

/**
 * rcu_dereference_protected() - fetch RCU pointer when updates prevented
 * @p: The pointer to read, prior to dereferencing
 * @c: The conditions under which the dereference will take place
 *
 * Return the value of the specified RCU-protected pointer, but omit
 * the READ_ONCE().  This is useful in cases where update-side locks
 * prevent the value of the pointer from changing.  Please note that this
 * primitive does *not* prevent the compiler from repeating this reference
 * or combining it with other references, so it should not be used without
 * protection of appropriate locks.
 *
 * This function is only for update-side use.  Using this function
 * when protected only by rcu_read_lock() will result in infrequent
 * but very ugly failures.
 */
#define rcu_dereference_protected(p, c) \
	__rcu_dereference_protected((p), (c), __rcu)

/**
 * rcu_dereference() - fetch RCU-protected pointer for dereferencing
 * @p: The pointer to read, prior to dereferencing
 *
 * This is a simple wrapper around rcu_dereference_check().
 */
#define rcu_dereference(p) rcu_dereference_check(p, 0)

/**
 * rcu_dereference_bh() - fetch an RCU-bh-protected pointer for dereferencing
 * @p: The pointer to read, prior to dereferencing
 *
 * Makes rcu_dereference_check() do the dirty work.
 */
#define rcu_dereference_bh(p) rcu_dereference_bh_check(p, 0)

/**
 * rcu_dereference_sched() - fetch RCU-sched-protected pointer for dereferencing
 * @p: The pointer to read, prior to dereferencing
 *
 * Makes rcu_dereference_check() do the dirty work.
 */
#define rcu_dereference_sched(p) rcu_dereference_sched_check(p, 0)

/**
 * rcu_pointer_handoff() - Hand off a pointer from RCU to other mechanism
 * @p: The pointer to hand off
 *
 * This is simply an identity function, but it documents where a pointer
 * is handed off from RCU to some other synchronization mechanism, for
 * example, reference counting or locking.  In C11, it would map to
 * kill_dependency().  It could be used as follows::
 *
 *	rcu_read_lock();
 *	p = rcu_dereference(gp);
 *	long_lived = is_long_lived(p);
 *	if (long_lived) {
 *		if (!atomic_inc_not_zero(p->refcnt))
 *			long_lived = false;
 *		else
 *			p = rcu_pointer_handoff(p);
 *	}
 *	rcu_read_unlock();
 */
#define rcu_pointer_handoff(p) (p)

/**
 * rcu_read_lock() - mark the beginning of an RCU read-side critical section
 *
 * When synchronize_rcu() is invoked on one CPU while other CPUs
 * are within RCU read-side critical sections, then the
 * synchronize_rcu() is guaranteed to block until after all the other
 * CPUs exit their critical sections.  Similarly, if call_rcu() is invoked
 * on one CPU while other CPUs are within RCU read-side critical
 * sections, invocation of the corresponding RCU callback is deferred
 * until after the all the other CPUs exit their critical sections.
 *
 * In v5.0 and later kernels, synchronize_rcu() and call_rcu() also
 * wait for regions of code with preemption disabled, including regions of
 * code with interrupts or softirqs disabled.  In pre-v5.0 kernels, which
 * define synchronize_sched(), only code enclosed within rcu_read_lock()
 * and rcu_read_unlock() are guaranteed to be waited for.
 *
 * Note, however, that RCU callbacks are permitted to run concurrently
 * with new RCU read-side critical sections.  One way that this can happen
 * is via the following sequence of events: (1) CPU 0 enters an RCU
 * read-side critical section, (2) CPU 1 invokes call_rcu() to register
 * an RCU callback, (3) CPU 0 exits the RCU read-side critical section,
 * (4) CPU 2 enters a RCU read-side critical section, (5) the RCU
 * callback is invoked.  This is legal, because the RCU read-side critical
 * section that was running concurrently with the call_rcu() (and which
 * therefore might be referencing something that the corresponding RCU
 * callback would free up) has completed before the corresponding
 * RCU callback is invoked.
 *
 * RCU read-side critical sections may be nested.  Any deferred actions
 * will be deferred until the outermost RCU read-side critical section
 * completes.
 *
 * You can avoid reading and understanding the next paragraph by
 * following this rule: don't put anything in an rcu_read_lock() RCU
 * read-side critical section that would block in a !PREEMPTION kernel.
 * But if you want the full story, read on!
 *
 * In non-preemptible RCU implementations (pure TREE_RCU and TINY_RCU),
 * it is illegal to block while in an RCU read-side critical section.
 * In preemptible RCU implementations (PREEMPT_RCU) in CONFIG_PREEMPTION
 * kernel builds, RCU read-side critical sections may be preempted,
 * but explicit blocking is illegal.  Finally, in preemptible RCU
 * implementations in real-time (with -rt patchset) kernel builds, RCU
 * read-side critical sections may be preempted and they may also block, but
 * only when acquiring spinlocks that are subject to priority inheritance.
 */
static __always_inline void rcu_read_lock(void)
{
	__rcu_read_lock();
	__acquire(RCU);
	rcu_lock_acquire(&rcu_lock_map);
	RCU_LOCKDEP_WARN(!rcu_is_watching(),
			 "rcu_read_lock() used illegally while idle");
}

/*
 * So where is rcu_write_lock()?  It does not exist, as there is no
 * way for writers to lock out RCU readers.  This is a feature, not
 * a bug -- this property is what provides RCU's performance benefits.
 * Of course, writers must coordinate with each other.  The normal
 * spinlock primitives work well for this, but any other technique may be
 * used as well.  RCU does not care how the writers keep out of each
 * others' way, as long as they do so.
 */

/**
 * rcu_read_unlock() - marks the end of an RCU read-side critical section.
 *
 * In almost all situations, rcu_read_unlock() is immune from deadlock.
 * In recent kernels that have consolidated synchronize_sched() and
 * synchronize_rcu_bh() into synchronize_rcu(), this deadlock immunity
 * also extends to the scheduler's runqueue and priority-inheritance
 * spinlocks, courtesy of the quiescent-state deferral that is carried
 * out when rcu_read_unlock() is invoked with interrupts disabled.
 *
 * See rcu_read_lock() for more information.
 */
static inline void rcu_read_unlock(void)
{
	RCU_LOCKDEP_WARN(!rcu_is_watching(),
			 "rcu_read_unlock() used illegally while idle");
	__release(RCU);
	__rcu_read_unlock();
	rcu_lock_release(&rcu_lock_map); /* Keep acq info for rls diags. */
}

/**
 * rcu_read_lock_bh() - mark the beginning of an RCU-bh critical section
 *
 * This is equivalent to rcu_read_lock(), but also disables softirqs.
 * Note that anything else that disables softirqs can also serve as an RCU
 * read-side critical section.  However, please note that this equivalence
 * applies only to v5.0 and later.  Before v5.0, rcu_read_lock() and
 * rcu_read_lock_bh() were unrelated.
 *
 * Note that rcu_read_lock_bh() and the matching rcu_read_unlock_bh()
 * must occur in the same context, for example, it is illegal to invoke
 * rcu_read_unlock_bh() from one task if the matching rcu_read_lock_bh()
 * was invoked from some other task.
 */
static inline void rcu_read_lock_bh(void)
{
	local_bh_disable();
	__acquire(RCU_BH);
	rcu_lock_acquire(&rcu_bh_lock_map);
	RCU_LOCKDEP_WARN(!rcu_is_watching(),
			 "rcu_read_lock_bh() used illegally while idle");
}

/**
 * rcu_read_unlock_bh() - marks the end of a softirq-only RCU critical section
 *
 * See rcu_read_lock_bh() for more information.
 */
static inline void rcu_read_unlock_bh(void)
{
	RCU_LOCKDEP_WARN(!rcu_is_watching(),
			 "rcu_read_unlock_bh() used illegally while idle");
	rcu_lock_release(&rcu_bh_lock_map);
	__release(RCU_BH);
	local_bh_enable();
}

/**
 * rcu_read_lock_sched() - mark the beginning of a RCU-sched critical section
 *
 * This is equivalent to rcu_read_lock(), but also disables preemption.
 * Read-side critical sections can also be introduced by anything else that
 * disables preemption, including local_irq_disable() and friends.  However,
 * please note that the equivalence to rcu_read_lock() applies only to
 * v5.0 and later.  Before v5.0, rcu_read_lock() and rcu_read_lock_sched()
 * were unrelated.
 *
 * Note that rcu_read_lock_sched() and the matching rcu_read_unlock_sched()
 * must occur in the same context, for example, it is illegal to invoke
 * rcu_read_unlock_sched() from process context if the matching
 * rcu_read_lock_sched() was invoked from an NMI handler.
 */
static inline void rcu_read_lock_sched(void)
{
	preempt_disable();
	__acquire(RCU_SCHED);
	rcu_lock_acquire(&rcu_sched_lock_map);
	RCU_LOCKDEP_WARN(!rcu_is_watching(),
			 "rcu_read_lock_sched() used illegally while idle");
}

/* Used by lockdep and tracing: cannot be traced, cannot call lockdep. */
static inline notrace void rcu_read_lock_sched_notrace(void)
{
	preempt_disable_notrace();
	__acquire(RCU_SCHED);
}

/**
 * rcu_read_unlock_sched() - marks the end of a RCU-classic critical section
 *
 * See rcu_read_lock_sched() for more information.
 */
static inline void rcu_read_unlock_sched(void)
{
	RCU_LOCKDEP_WARN(!rcu_is_watching(),
			 "rcu_read_unlock_sched() used illegally while idle");
	rcu_lock_release(&rcu_sched_lock_map);
	__release(RCU_SCHED);
	preempt_enable();
}

/* Used by lockdep and tracing: cannot be traced, cannot call lockdep. */
static inline notrace void rcu_read_unlock_sched_notrace(void)
{
	__release(RCU_SCHED);
	preempt_enable_notrace();
}

/**
 * RCU_INIT_POINTER() - initialize an RCU protected pointer
 * @p: The pointer to be initialized.
 * @v: The value to initialized the pointer to.
 *
 * Initialize an RCU-protected pointer in special cases where readers
 * do not need ordering constraints on the CPU or the compiler.  These
 * special cases are:
 *
 * 1.	This use of RCU_INIT_POINTER() is NULLing out the pointer *or*
 * 2.	The caller has taken whatever steps are required to prevent
 *	RCU readers from concurrently accessing this pointer *or*
 * 3.	The referenced data structure has already been exposed to
 *	readers either at compile time or via rcu_assign_pointer() *and*
 *
 *	a.	You have not made *any* reader-visible changes to
 *		this structure since then *or*
 *	b.	It is OK for readers accessing this structure from its
 *		new location to see the old state of the structure.  (For
 *		example, the changes were to statistical counters or to
 *		other state where exact synchronization is not required.)
 *
 * Failure to follow these rules governing use of RCU_INIT_POINTER() will
 * result in impossible-to-diagnose memory corruption.  As in the structures
 * will look OK in crash dumps, but any concurrent RCU readers might
 * see pre-initialized values of the referenced data structure.  So
 * please be very careful how you use RCU_INIT_POINTER()!!!
 *
 * If you are creating an RCU-protected linked structure that is accessed
 * by a single external-to-structure RCU-protected pointer, then you may
 * use RCU_INIT_POINTER() to initialize the internal RCU-protected
 * pointers, but you must use rcu_assign_pointer() to initialize the
 * external-to-structure pointer *after* you have completely initialized
 * the reader-accessible portions of the linked structure.
 *
 * Note that unlike rcu_assign_pointer(), RCU_INIT_POINTER() provides no
 * ordering guarantees for either the CPU or the compiler.
 */
#define RCU_INIT_POINTER(p, v) \
	do { \
		rcu_check_sparse(p, __rcu); \
		WRITE_ONCE(p, RCU_INITIALIZER(v)); \
	} while (0)

/**
 * RCU_POINTER_INITIALIZER() - statically initialize an RCU protected pointer
 * @p: The pointer to be initialized.
 * @v: The value to initialized the pointer to.
 *
 * GCC-style initialization for an RCU-protected pointer in a structure field.
 */
#define RCU_POINTER_INITIALIZER(p, v) \
		.p = RCU_INITIALIZER(v)

/*
 * Does the specified offset indicate that the corresponding rcu_head
 * structure can be handled by kvfree_rcu()?
 */
#define __is_kvfree_rcu_offset(offset) ((offset) < 4096)

/**
 * kfree_rcu() - kfree an object after a grace period.
 * @ptr: pointer to kfree for both single- and double-argument invocations.
 * @rhf: the name of the struct rcu_head within the type of @ptr,
 *       but only for double-argument invocations.
 *
 * Many rcu callbacks functions just call kfree() on the base structure.
 * These functions are trivial, but their size adds up, and furthermore
 * when they are used in a kernel module, that module must invoke the
 * high-latency rcu_barrier() function at module-unload time.
 *
 * The kfree_rcu() function handles this issue.  Rather than encoding a
 * function address in the embedded rcu_head structure, kfree_rcu() instead
 * encodes the offset of the rcu_head structure within the base structure.
 * Because the functions are not allowed in the low-order 4096 bytes of
 * kernel virtual memory, offsets up to 4095 bytes can be accommodated.
 * If the offset is larger than 4095 bytes, a compile-time error will
 * be generated in kvfree_rcu_arg_2(). If this error is triggered, you can
 * either fall back to use of call_rcu() or rearrange the structure to
 * position the rcu_head structure into the first 4096 bytes.
 *
 * Note that the allowable offset might decrease in the future, for example,
 * to allow something like kmem_cache_free_rcu().
 *
 * The BUILD_BUG_ON check must not involve any function calls, hence the
 * checks are done in macros here.
 */
#define kfree_rcu(ptr, rhf...) kvfree_rcu(ptr, ## rhf)

/**
 * kvfree_rcu() - kvfree an object after a grace period.
 *
 * This macro consists of one or two arguments and it is
 * based on whether an object is head-less or not. If it
 * has a head then a semantic stays the same as it used
 * to be before:
 *
 *     kvfree_rcu(ptr, rhf);
 *
 * where @ptr is a pointer to kvfree(), @rhf is the name
 * of the rcu_head structure within the type of @ptr.
 *
 * When it comes to head-less variant, only one argument
 * is passed and that is just a pointer which has to be
 * freed after a grace period. Therefore the semantic is
 *
 *     kvfree_rcu(ptr);
 *
 * where @ptr is a pointer to kvfree().
 *
 * Please note, head-less way of freeing is permitted to
 * use from a context that has to follow might_sleep()
 * annotation. Otherwise, please switch and embed the
 * rcu_head structure within the type of @ptr.
 */
#define kvfree_rcu(...) KVFREE_GET_MACRO(__VA_ARGS__,		\
	kvfree_rcu_arg_2, kvfree_rcu_arg_1)(__VA_ARGS__)

#define KVFREE_GET_MACRO(_1, _2, NAME, ...) NAME
#define kvfree_rcu_arg_2(ptr, rhf)					\
do {									\
	typeof (ptr) ___p = (ptr);					\
									\
	if (___p) {									\
		BUILD_BUG_ON(!__is_kvfree_rcu_offset(offsetof(typeof(*(ptr)), rhf)));	\
		kvfree_call_rcu(&((___p)->rhf), (rcu_callback_t)(unsigned long)		\
			(offsetof(typeof(*(ptr)), rhf)));				\
	}										\
} while (0)

#define kvfree_rcu_arg_1(ptr)					\
do {								\
	typeof(ptr) ___p = (ptr);				\
								\
	if (___p)						\
		kvfree_call_rcu(NULL, (rcu_callback_t) (___p));	\
} while (0)

/*
 * Place this after a lock-acquisition primitive to guarantee that
 * an UNLOCK+LOCK pair acts as a full barrier.  This guarantee applies
 * if the UNLOCK and LOCK are executed by the same CPU or if the
 * UNLOCK and LOCK operate on the same lock variable.
 */
#ifdef CONFIG_ARCH_WEAK_RELEASE_ACQUIRE
#define smp_mb__after_unlock_lock()	smp_mb()  /* Full ordering for lock. */
#else /* #ifdef CONFIG_ARCH_WEAK_RELEASE_ACQUIRE */
#define smp_mb__after_unlock_lock()	do { } while (0)
#endif /* #else #ifdef CONFIG_ARCH_WEAK_RELEASE_ACQUIRE */

/* Has the specified rcu_head structure been handed to call_rcu()? */

/**
 * rcu_head_init - Initialize rcu_head for rcu_head_after_call_rcu()
 * @rhp: The rcu_head structure to initialize.
 *
 * If you intend to invoke rcu_head_after_call_rcu() to test whether a
 * given rcu_head structure has already been passed to call_rcu(), then
 * you must also invoke this rcu_head_init() function on it just after
 * allocating that structure.  Calls to this function must not race with
 * calls to call_rcu(), rcu_head_after_call_rcu(), or callback invocation.
 */
static inline void rcu_head_init(struct rcu_head *rhp)
{
	rhp->func = (rcu_callback_t)~0L;
}

/**
 * rcu_head_after_call_rcu() - Has this rcu_head been passed to call_rcu()?
 * @rhp: The rcu_head structure to test.
 * @f: The function passed to call_rcu() along with @rhp.
 *
 * Returns @true if the @rhp has been passed to call_rcu() with @func,
 * and @false otherwise.  Emits a warning in any other case, including
 * the case where @rhp has already been invoked after a grace period.
 * Calls to this function must not race with callback invocation.  One way
 * to avoid such races is to enclose the call to rcu_head_after_call_rcu()
 * in an RCU read-side critical section that includes a read-side fetch
 * of the pointer to the structure containing @rhp.
 */
static inline bool
rcu_head_after_call_rcu(struct rcu_head *rhp, rcu_callback_t f)
{
	rcu_callback_t func = READ_ONCE(rhp->func);

if (func == f)
		return true;
	WARN_ON_ONCE(func != (rcu_callback_t)~0L);
	return false;
}

/* kernel/ksysfs.c definitions */
extern int rcu_expedited;
extern int rcu_normal;

DEFINE_LOCK_GUARD_0(rcu, rcu_read_lock(), rcu_read_unlock())

#endif /* __LINUX_RCUPDATE_H */

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